Bulb



FIG. 1 is a front elevational view of a bulb showing my new design therefor;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

CLAIM The ornamental design for a bulb, as shown and described. 